Commutator



June 5, 1928.

1,672,685 G. LEWINNEK COMMUTATOR Filed Jan. 4, 1926 4 f 2 /0 3 7 a; x

Mn *7 g I I T 7' if /.5 1

Inventon:

HLSAttOPfiGU.

Patented June 5, 192 8. I

l UNITE-D STATES PATENT OFFICE.

GEoRG LEWINNEK, 0E BERLIN, GER-MANY, ASSIGNOR TO GENERAL ELECTRIC om- PANY, A CORPORATION 0E NEW YORK.

Cormu'mmon.

Application filed January 4, 1926,8eria1 No. 79,066, and in Germany January 22, 1925.

to the construction of a double commutator.

Where it has been necessary to make'the commutator of considerable length, it has been found desirable to divide the bars intermediate their ends so as to form in'eifect two series of bars separated by spaces for cooling air. The bars of each series have had their dovetails clamped by separate sets of clamping rings and separate bolts. After the winding had been connected to the bars it was diflicult to get at the securing bolts of that part of the commutator which was next to Winding to tighten the same when any looseness occurred. An object of my invention thereforeis to provide an improved construction of double commutator wherein this difficulty is obviated.

My invention will be better understood from the following description taken in connection with the accompanying drawing, and its scope will be pointed out in the appended claims.

In the single figure of the drawing, which is a fragmentary crosssectional view of a commutator embodying my invention, the body 1 of the commutator has the two wedge-shaped rings 2 and 3 with which co-operate the adjustable wedge-shaped rings 4 and 5 respectively to clamp the dovetails of the two series of commutator bars 6 and 7. Single throughbolts 8 serve to clamp the two adjustable rings 4 and 5 against the two series of commutator bars. The end portions 9 of the bolts 8, which era-respond to thewinding end of the comnmtator, are of reduced diameter and the shoulder 10 on each bolt is adapted to engage a shoulder ll on the body 1- where it passes therethrough. opposite ends of the bolts 8 engage the respective rings 4 and 5.

,lVhen the double commutator is being assembled, that half of the commutator which is next to the winding shown at the Nuts 12 and 13 at looseness occur in the bolts at their smaller ends or in the bars held thereby, it may i easily be remedied by tightening these .outer nuts 12. Both halves of the commutator may therefore be tightened by the same nuts.

hat I claim as new and desire to secure by Letters Patent of the United States, 1s,

1. A double commutator comprising a body portion having a plurality of fixed and adjustable clamping rings; a double series of bars engaged thereby; clamping bolts having means engaging said body for limiting their movement in one direction; said body, said bars, and said'rings being so formed that said bolts are freely removable in the other direction; and means carried by each of said bolts for clamping both series of said bars between said rings.

2. A double commutator comprising a body portion having a plurality of adjustable and fixed clamping rings, a double series of bars engaged thereby, clamping bolts having shoulders thereon, said body portion engaging the shoulders on said bolts for limiting their movement in one direction and being cutaway so that they are freely movable in the other direction, one of said adjustable rings having openings therein through which the shoulders on said bolts are removable, and adjustable means including said bolts for clamping said rings against said bars.

3. A double commutator comprising a body portion having a' plurality of adjustable and fixed clampii'lg rings, a double series of bars engaged thereby, clamping bolts having shoulders thereon, said body portion engaging the shoulders on said bolts for limiting their movement in one direc tion and being cut away so that they a1: freely movable in the other direction, and means carried by each of said bolts for clamping both series of said bars between said rings.

4. A double commutator comprising a body portion having a plurality of fixed and adjustable clamping rings, a double series ofbars engaged thereby, clamping bolt-s each extending through the fixed and adjustable rings, said bolts having means engaging one of the fixed rings for limiting their movement relative thereto 1n one direction and being'freely movable relative thereto in the other direction, and adjustable means on the ends of the bolts for enthe adjustablefrings.

5 A "double commutator comprising a body portion having fixedrings; a double series of commutator bars, an adjustable ring at each end of the commutator, and a pluralityrol through-bolts having nuts at each ent respectively engaging the adjustable rings, saidbol-ts having shoulders engaging one of said fixed rings for limiting their movement in one direction, said fixed;

ringsbeing formed soas to'permit removal of the bolts 1n the other direction whereby one series of bars may be assembled and clamped independently of the other series.

6.1L double commutator comprising a.

body portion having a central pair of fixed Winding end of the con'imutator may beassembled and clamped prior to the assembly of the'other series of bars.

In Witness whereof, I have hereunto set my hand this th dav of December. 1925.

GEQ'RG'LEWINNEK. 

